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scsi: remove the use_clustering flag

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The same effects can be achieved by setting the dma_boundary to
PAGE_SIZE - 1 and the max_segment_size to PAGE_SIZE, so shift those
settings into the drivers.  Note that in many cases the setting might
be bogus, but this keeps the status quo.

[mkp: fix myrs and myrb]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
2018-12-13 16:17:09 +01:00
committed by Martin K. Petersen
parent 1c3726ad30
commit 4af14d113b
37 changed files with 34 additions and 53 deletions
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13
include/scsi/scsi_host.h
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@@ -44,8 +44,6 @@ struct blk_queue_tags;
#define MODE_INITIATOR 0x01
#define MODE_TARGET 0x02
#define DISABLE_CLUSTERING (-1)
struct scsi_host_template {
struct module *module;
const char *name;
@@ -418,16 +416,6 @@ struct scsi_host_template {
*/
unsigned unchecked_isa_dma:1;
/*
* True if this host adapter can make good use of clustering.
* I originally thought that if the tablesize was large that it
* was a waste of CPU cycles to prepare a cluster list, but
* it works out that the Buslogic is faster if you use a smaller
* number of segments (i.e. use clustering). I guess it is
* inefficient.
*/
unsigned use_clustering:1;
/*
* True for emulated SCSI host adapters (e.g. ATAPI).
*/
@@ -626,7 +614,6 @@ struct Scsi_Host {
unsigned active_mode:2;
unsigned unchecked_isa_dma:1;
unsigned use_clustering:1;
/*
* Host has requested that no further requests come through for the